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was given this solution, Please advise on the solution

was given this solution, Please advise on the solution

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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I was given this solution, Please advise on the solution

Explanation of Solution Given Information: Diameter of the cylindrical duct d = 6 cm = 0.06m Ambient air is heated from 22 °C to 44°C Exit air velocities V, = 1m/s, V2 = 1.5 m/s Assumptions: No heat loss from the hating coil to outside air. Electric power required for the heating coil is, Power (P) = [Mass flow rate of air ] [Change in enthalpy ] Power (P) = [pAVmax] [h2 – hj] = [P D² Vmax ] [C,T2 – C,T1] %3D Consider density of air as, p = 1.2 kg/m? For air Cp = 1.005 kJ/kgK Power (P) = [1.2 x x 0.06² × 1.5|[1.005][44 – 22] = 0.1125 kW = 112.5 Watt
Transcribed Image Text:Explanation of Solution Given Information: Diameter of the cylindrical duct d = 6 cm = 0.06m Ambient air is heated from 22 °C to 44°C Exit air velocities V, = 1m/s, V2 = 1.5 m/s Assumptions: No heat loss from the hating coil to outside air. Electric power required for the heating coil is, Power (P) = [Mass flow rate of air ] [Change in enthalpy ] Power (P) = [pAVmax] [h2 – hj] = [P D² Vmax ] [C,T2 – C,T1] %3D Consider density of air as, p = 1.2 kg/m? For air Cp = 1.005 kJ/kgK Power (P) = [1.2 x x 0.06² × 1.5|[1.005][44 – 22] = 0.1125 kW = 112.5 Watt
A hair-dryer used in beauty saloons and homes is shown in Figure 2. The front end of a typical hairdryer is idealized as a thin-walled cylindrical duct with a 6 cm diameter with a fan at the inlet that blows air over an electric heating coil, as is shown in the figure. The design of this hairdryer requires two power settings, with which the air blown over the electric heating coil is heated from the ambient temperature of 22 °C to an outlet temperature of 44 °C, and with exit air velocities of 1 m/s and 1.5 m/s. Estimate the electric power required for the heating coil to meet these conditions. Assume that the heat loss from the outside of the dryer duct is neglected.
Transcribed Image Text:A hair-dryer used in beauty saloons and homes is shown in Figure 2. The front end of a typical hairdryer is idealized as a thin-walled cylindrical duct with a 6 cm diameter with a fan at the inlet that blows air over an electric heating coil, as is shown in the figure. The design of this hairdryer requires two power settings, with which the air blown over the electric heating coil is heated from the ambient temperature of 22 °C to an outlet temperature of 44 °C, and with exit air velocities of 1 m/s and 1.5 m/s. Estimate the electric power required for the heating coil to meet these conditions. Assume that the heat loss from the outside of the dryer duct is neglected.
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